Occasionally I get a weird error with the background color in vim when scrolling up in a long file. The background over the text is correct, but everywhere there is no printable character the background turns black.
After a bit of hunting and experimenting, I have found that :redraw! fixes the problem, but I would like to know why this occurs and if there is anything I can do to permanently fix the issue.
Although I have gotten this error to occur with other color schemes, for what it is worth I am using the lucius color scheme with vim 7.3 editing a bunch of python files.